Could Pinterest already be worth $500M?

VentureBeat: Digital pin-board site Pinterest is scorching hot. People are pinning like crazy. Publishers are benefiting from an uptick in Pinterest-driven traffic. And venture capitalists are tripping over themselves to get a piece of the social property.

But does all this interest warrant a $500 million valuation, especially without any substantial revenue streams to speak of? Absolutely, says private financial data company PrivCo.